Compression tray



5 Aug. 19, 924. 1,505,862

H. M. CARROLL, SR

COMPRESS I 0N TRAY Filed June 9, 1923 141 01 Mom Patented Aug. 19, 1924.

UNITED STATES HOUSTON M. CARROLL, SR-.,

OF SAN ANTONIO, TEXAS.

COMPRESSION TRAY.

Application filed. June 3,

To all whom it may concern:

Be it known that I, T-IOUSTON M. CARROLL, S12. a citizen of the United States, residing at San Antonio, in the county of Beam and State of Texas, have invented a new and useful Compression Tray, of which the following is a specification.

By way of explanation, it may be stated that as is well understood by those skilled in the art, plaster of Paris, or other like material, contained in an impression cup frequently is used for taking impressions of the human mouth, in connection with the operation of making artificial dentures. The palatine arch is much harder and more unyielding than is the alveolar ridge, and the result is that when a bite is taken on the plastic material in an impression tray, the water is pressed out of the central portion of the mass, by the hard palatine arch, and flows to the edges of the tray thereby softening the material in which the impression of the alveolar ridge is received. The unsatisfactory results fiowing from the foregoing operation are obvious.

lVith the foregoing remarks, this invention aims to provide an impression tray the central portion of which is so constructed as to permit the central portion of the plastic mass to yield, under the pressure of the palatine arch, so that the water will not be pressed out of the central portion of the mass, thereby softening that portion of the mass wherein the impression of the alveolar ridge is received.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the invention appertains.

WVith the above and other objects in view, which'will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in top plan, a tray constructed in accordance with the invention;

1923. Serial No. 644,485.

Figure 2 is a bottom plan; Figure 3 is a side elevation; Figure 4 is a longitudinal section.

The tray forming the subject matter of this a 'iplication preferably is made of metal and includes a body 1 comprising a base 2 and an upstanding marginal rim 3, the base 2 being arched or convened both longitudinally and transversely, as shown in Figure l. The base 2 has openings 4t preferably in the form of elongated slots disposed in parallel relation and extended transversely of the base, the openings terminating short of the outer edge of the base, to leave an imperforate portion 5 in the base, about the outer edge of the base.

he handle 6 for the tray may be fashioned as desired. Tt may consist of a plate 7 having an opening 8 whereby the tray may be suspended conveniently when not in use, the plate 7 being provided at its inner end with an upstanding flange 9 joined to the rim 3 of the tray the parts 9 and 7 being distorted at their place of juncture to form reinforcingribs 10.

In practical operation, the tray is filled with plaster of Paris or like material, that portion of the mass which covers the slots or openings 4: being pressed through the slots to some extent by the relatively hard palatine arch an undue compression of the material being avoided, and the water being prevented from being pressed out of the mass. The imperforate portion 5 of the base 2 supports that part of the mass of plastic material wherein the impression of the alveolar ridge is received.

l Vhat is claimed is:

A dental impression tray comprising a base and a marginal flange projecting therefrom, the base being provided with openings which terminate short of the place of juncture between the base and the flange, to leave an imperforate portion in the base adj acent to the flange, the openings being so shaped, located, and of such a size, as to leave enough material in the base to form an adequate support for the impression material when the same is compressed against the relatively hard palatine arch, and so shaped, located, and of such a size, as to permit the impression material to retire through the openings, and to permit the liquid in the im- In testimony that I claim the foregoing as pression material to drain through the openmy own, I have hereto afiixed my signature ings, before the liquid can flow upon said in the presence of tWo Witnesses. imperforate portion of the base and soften HOUSTON M. CARROLL, SR. that part of the impression material which Witnesses:

is engaged by the relatively soft alveolar J. P. OLDHAM,

ridge. H. M. CARNIE, Jr. 

